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Chapter 2: Q8. (page 41)

Can an object be increasing in speed as its acceleration decreases? If so, give an example. If not, explain.

Short Answer

Expert verified

Yes, an object is increasing in speed as its acceleration decreases.

Step by step solution

01

Step 1. Meaning of acceleration

Acceleration can be defined as the rate of change of velocity of an object. It is a vector quantity since it has both direction and magnitude.

02

Step 2. Citing an example explaining that an object is increasing in speed as its acceleration decreases

Assume the north to be the positive direction. If a car is going south and gaining speed at an increasing rate, the magnitude of its acceleration is large. However, since the acceleration is directed southward, it becomes increasingly negative.

In other words, the acceleration of the car decreases as its speed increases.

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Most popular questions from this chapter

A sports car accelerates approximately as shown in the velocity-time graph of Fig. 2-43. (The short flat spots in the curve represent manual shifting of the gears.) Estimate the car’s average acceleration in (a) second gear and (b) fourth gear.

FIGURE 2-43Problem 56. The velocity of a car as a function of time, starting from a dead stop. The flat spots in the curve represent gear shifts.

Can an object have zero acceleration and non-zero velocity at the same time? Give examples.

A baseball is seen to pass upward by a window with a vertical speed of 14 m/s. If the ball was thrown by a person 18 m below on the street, (a) what was its initial speed, (b) what altitude did it reach, (c) when was it thrown, and (d) when does it reach the street again?

At highway speed, a particular automobile is capable of an acceleration of about 1.8 m/s2. At this rate, how long does it take to accelerate from 65 km/h to 120 km/h?

A falling stone takes 0.31 s to travel past a window that is 2.2 m tall (Fig. 2-41). From what height above the top of the window did the stone fall?
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